Is it possible that the instances were created in a version of the form where the stage was not defined as a closed stage? If so, map the instances to the latest version of the form and submit each one again.

No the instances were created using the latest version of the form. Not sure what you mean submit each one again. Each of our instances are serial numbered for audit purposes in a financial environment. We can’t just delete a form and re-do it if that is what you mean.

I understand that mapping an instance to a new version will not actually be in the new version until it is opened and submitted. My question is, if an old instance has apparently gone through its whole process from the opening stage to a closed stage how can it be opened and submitted.